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OpenAI Has New Agentic Coding Partner for You Now: GPT-5-Codex

GPT-5-Codex dynamically adjusts processing time up to seven hours for coding tasks, improving code reviews with fewer errors and stronger comments, enhancing AI coding tool competitiveness.

  • OpenAI announced today the release of GPT-5-Codex, a new coding-optimized variant of GPT-5 integrated into the Codex ecosystem.
  • OpenAI developed GPT-5-Codex to improve autonomous coding tasks, addressing developer demand amid a crowded AI coding tools market.
  • The model supports long and short coding sessions, runs tests, refactors code in multiple languages, accepts images as input, and integrates deeply with IDEs including VS Code.
  • GPT-5-Codex achieved 74.5% accuracy on SWE-bench Verified and scored 51.3% on refactoring tasks, outperforming GPT-5, while usage surged 10 times in one month.
  • OpenAI plans an API release, expects Codex to shift developer focus toward oversight and complex decisions, and emphasizes safety through sandboxing and policy controls.
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ZDNet broke the news in United States on Monday, September 15, 2025.
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